NASA: It is happening now - Está sucediendo ahora - 29-04-11 - United States - Heavy Rain in Central United States - Earthquake Swarm near Hawthorne. Nevada

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Heavy Rain in Central United States

Heavy Rain in Central United States
Color bar for Heavy Rain in Central United States
With rivers in the Midwestern United States already full from thawing winter snow cover, severe rainfall in late April added to the troubles for the region. The National Weather Service predicted in February that the region was primed for flooding, and so far it has lived up to the advanced billing. On the afternoon of April 26, 2011, the Advanced Hydrological Prediction Service (AHPS) was reporting major flooding at 48 river gauges and moderate flooding at 86 gauges along central U.S. rivers.
This map depicts rainfall for the Midwestern U.S. from April 19 to 25, 2011. The estimates were made from the Multi-satellite Precipitation Analysis, based on data from the Tropical Rainfall Measuring Mission (TRMM). Shown in shades of green and blue, rainfall estimates range from 150 millimeters (5.9 inches) to greater than 525 millimeters (20.7 inches).
Ground monitors for the AHPS reported 13.70 inches (348 mm) of rainfall in the southeastern Missouri town of Poplar Bluff between April 22-26. The nearby Black River was pouring over its levee in at least 30 places, and people were evacuated from more than 1,000 homes.
Westville, Oklahoma, received 14.96 inches (380 mm) of rain. In Arkansas, the town of Springdale was deluged with 19.70 inches (500 mm), while nearby Fayetteville collected 13.85 inches (352 mm). The governor of Arkansas declared a state of emergency.
In Carbondale, Illinois, and Paducah, Kentucky—both near the confluence of the Mississippi and Ohio rivers—roughly 9 inches (230 mm) fell, leading the governor of Kentucky to declare a state of emergency in advance of a significant flood when the two swollen rivers converge. The U.S. Army Corps of Engineers was planning on April 26 to “take the extraordinary step of intentionally breaching the Birds Point levee in southeast Missouri, just downriver of the confluence, in a bid to reduce the amount of water moving down the Mississippi,” the Associated Press reported. Breaching the levee was expected to flood up to 130,000 acres of farmland.
NOAA's Hydrometeorological Prediction Center was predicting more heavy rain and severe weather through mid-week in the Mississippi and Ohio river valleys; flood warnings and watches were posted for both basins, as well as the Tennessee Valley. On April 25, the rains were accompanied by at least 38 tornadoes, according to the National Weather Service, and conditions were ripe for more in the coming days.
  1. References

  2. National Weather Service (n.d) Advanced Hydrological Prediction Service. Accessed April 26, 2011.
  3. Associated Press, via Yahoo News (2011, April 26). Storms unleash deadly tornado, flooding on Midwest. Accessed April 26, 2011.
  4. The Washington Post (2011, April 26). Capital Weather Gang: Dangerous severe weather outbreak threatens for second straight day. Accessed April 26, 2011.
  5. NOAA National Centers for Environmental Prediction (n.d) Hydrometeorological Prediction Center. Accessed April 26, 2011.
More images of this event in Natural Hazards
NASA Earth Observatory image by Jesse Allen, using near-real-time data provided courtesy of TRMM Science Data and Information System at Goddard Space Flight Center. Caption by Michael Carlowicz.

Earthquake Swarm near Hawthorne, Nevada

Earthquake Swarm near Hawthorne, Nevada

For several weeks in March and April 2011, a swarm of earthquakes has shaken the ground near Hawthorne, Nevada. The small- and medium-sized earthquakes have been concentrated near Buller Mountain, in an area of about 10 square kilometers (4 square miles). Over 400 earthquakes above magnitude 1.0 have occurred since April 10, up to a magnitude of 4.6.
This map shows earthquake locations (white circles) from March 5, 2011, through the early morning of April 27, superimposed on a natural-color satellite image from September 19, 2002. At low elevations, the lightly vegetated land is tan, while the Wassuk Range is covered in dark green forest. Several abandoned mines are visible as bright scars on the landscape, and the lava flows of Mud Springs Volcano are dark gray. The image was acquired by the Enhanced Thematic Mapper Plus (ETM+) aboard Landsat 7.
Although the earthquake swarm has been adjacent to the Aurora-Bodie Volcanic Field, the earthquakes are tectonic in origin, not volcanic. Geologists distinguish between tectonic and volcanic earthquakes by looking at the waveforms recorded by seismographs. High-frequency events with a sharp onset—like a drum beat—are tectonic. Earthquakes that are long lasting and low- or medium-frequency—like a sustained note—are likely to be volcanic.
The Hawthorne earthquake swarm occurred in the Basin and Range geologic province, an area of flat, low elevation valleys situated between linear mountain ranges. The Basin and Range stretches from the Sierra Nevada in the west to central Utah in the east, and the complex topography is caused by the uplift, stretching, and thinning of the North American crust. The stretching crust results in the frequent earthquakes and occasional volcanism in the area.
  1. References

  2. The Nevada Seismological Laboratory. (2011, April 27). The Nevada 2011 Hawthorne Earthquake Sequence. Accessed April 28, 2011.
  3. University of Nevada, Reno. (2011, April 20). University steps-up monitoring after Hawthorne quake swarm. Accessed April 28, 2011.
NASA Earth Observatory image by Robert Simmon, using data from Landsat 7 and the Nevada Seismological Laboratory. Caption by Robert Simmon. Special thanks to Ken Smith of the Nevada Seismological Laboratory.
Landsat 7 - ETM+

NASA: It is happening now - Está sucediendo ahora - 29-04-11 - United States - Heavy Rain in Central United States - Earthquake Swarm near Hawthorne. Nevada

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